Antenna



FIG. 1 is a front elevation view of an antenna in a position of use within a base;

FIG. 2 is a side plan view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is top perspective view thereof;

FIG. 5 is a front elevation view of the antenna of FIG. 1;

FIG. 6 is a side elevation view thereof; and,

FIG. 7 is a top plan view thereof.

The broken lines showing a base in FIGS. 1-4 represent unclaimed environment only and form no part of the claimed design. 

CLAIM The ornamental design for an antenna, as shown and described. 